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preenfm2 and preenfm3 / Re: Will PreenFM2 boot without the DAC?
« on: October 26, 2020, 12:03:49 AM »But you confirm it's a F405 on it and not a F103 ?
If you have the bootloader showing up at boot without pressing any button, yes that means the bootloader detects a pressed button and starts, instead of jumping to the firmware.
If you want to modify and recompile the bootloader you need the CS4344Rebased branch which is not yet merged in the master branch on github :
https://github.com/Ixox/preenfm2/commits/CS4344Rebased
Yes it's a F405 - I got that much right at least ;-) I might replace it though as it was initially connected with the F405 VCAP pins not considered and they got 3.3v. So although the STM isn't dead, maybe it is not healthy.
I looked for the CS4344 version schematics but could not find them? Are they released?
Thanks for your time - much appreciated :-)